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# Copyright 2016 The TensorFlow Authors. All Rights Reserved.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
# ==============================================================================
"""Tests for contrib.seq2seq.python.seq2seq.decoder."""
# pylint: disable=unused-import,g-bad-import-order
from __future__ import absolute_import
from __future__ import division
from __future__ import print_function
# pylint: enable=unused-import
import numpy as np
from tensorflow.contrib.seq2seq.python.ops import decoder
from tensorflow.contrib.seq2seq.python.ops import helper as helper_py
from tensorflow.contrib.seq2seq.python.ops import basic_decoder
from tensorflow.python.framework import dtypes
from tensorflow.python.ops import rnn
from tensorflow.python.ops import rnn_cell
from tensorflow.python.ops import variables
from tensorflow.python.ops import variable_scope as vs
from tensorflow.python.platform import test
# pylint: enable=g-import-not-at-top
class DynamicDecodeRNNTest(test.TestCase):
def _testDynamicDecodeRNN(self, time_major, maximum_iterations=None):
sequence_length = [3, 4, 3, 1, 0]
batch_size = 5
max_time = 8
input_depth = 7
cell_depth = 10
max_out = max(sequence_length)
with self.test_session(use_gpu=True) as sess:
if time_major:
inputs = np.random.randn(max_time, batch_size,
input_depth).astype(np.float32)
else:
inputs = np.random.randn(batch_size, max_time,
input_depth).astype(np.float32)
cell = rnn_cell.LSTMCell(cell_depth)
helper = helper_py.TrainingHelper(
inputs, sequence_length, time_major=time_major)
my_decoder = basic_decoder.BasicDecoder(
cell=cell,
helper=helper,
initial_state=cell.zero_state(
dtype=dtypes.float32, batch_size=batch_size))
final_outputs, final_state, final_sequence_length = (
decoder.dynamic_decode(my_decoder, output_time_major=time_major,
maximum_iterations=maximum_iterations))
def _t(shape):
if time_major:
return (shape[1], shape[0]) + shape[2:]
return shape
self.assertTrue(
isinstance(final_outputs, basic_decoder.BasicDecoderOutput))
self.assertTrue(isinstance(final_state, rnn_cell.LSTMStateTuple))
self.assertEqual(
(batch_size,),
tuple(final_sequence_length.get_shape().as_list()))
self.assertEqual(
_t((batch_size, None, cell_depth)),
tuple(final_outputs.rnn_output.get_shape().as_list()))
self.assertEqual(
_t((batch_size, None)),
tuple(final_outputs.sample_id.get_shape().as_list()))
sess.run(variables.global_variables_initializer())
sess_results = sess.run({
"final_outputs": final_outputs,
"final_state": final_state,
"final_sequence_length": final_sequence_length,
})
# Mostly a smoke test
time_steps = max_out
expected_length = sequence_length
if maximum_iterations is not None:
time_steps = min(max_out, maximum_iterations)
expected_length = [min(x, maximum_iterations) for x in expected_length]
self.assertEqual(
_t((batch_size, time_steps, cell_depth)),
sess_results["final_outputs"].rnn_output.shape)
self.assertEqual(
_t((batch_size, time_steps)),
sess_results["final_outputs"].sample_id.shape)
self.assertItemsEqual(expected_length,
sess_results["final_sequence_length"])
def testDynamicDecodeRNNBatchMajor(self):
self._testDynamicDecodeRNN(time_major=False)
def testDynamicDecodeRNNTimeMajor(self):
self._testDynamicDecodeRNN(time_major=True)
def testDynamicDecodeRNNZeroMaxIters(self):
self._testDynamicDecodeRNN(time_major=True, maximum_iterations=0)
def testDynamicDecodeRNNOneMaxIter(self):
self._testDynamicDecodeRNN(time_major=True, maximum_iterations=1)
def _testDynamicDecodeRNNWithTrainingHelperMatchesDynamicRNN(
self, use_sequence_length):
sequence_length = [3, 4, 3, 1, 0]
batch_size = 5
max_time = 8
input_depth = 7
cell_depth = 10
max_out = max(sequence_length)
with self.test_session(use_gpu=True) as sess:
inputs = np.random.randn(batch_size, max_time,
input_depth).astype(np.float32)
cell = rnn_cell.LSTMCell(cell_depth)
zero_state = cell.zero_state(dtype=dtypes.float32, batch_size=batch_size)
helper = helper_py.TrainingHelper(inputs, sequence_length)
my_decoder = basic_decoder.BasicDecoder(
cell=cell, helper=helper, initial_state=zero_state)
# Match the variable scope of dynamic_rnn below so we end up
# using the same variables
with vs.variable_scope("root") as scope:
final_decoder_outputs, final_decoder_state, _ = decoder.dynamic_decode(
my_decoder,
# impute_finished=True ensures outputs and final state
# match those of dynamic_rnn called with sequence_length not None
impute_finished=use_sequence_length,
scope=scope)
with vs.variable_scope(scope, reuse=True) as scope:
final_rnn_outputs, final_rnn_state = rnn.dynamic_rnn(
cell,
inputs,
sequence_length=sequence_length if use_sequence_length else None,
initial_state=zero_state,
scope=scope)
sess.run(variables.global_variables_initializer())
sess_results = sess.run({
"final_decoder_outputs": final_decoder_outputs,
"final_decoder_state": final_decoder_state,
"final_rnn_outputs": final_rnn_outputs,
"final_rnn_state": final_rnn_state
})
# Decoder only runs out to max_out; ensure values are identical
# to dynamic_rnn, which also zeros out outputs and passes along state.
self.assertAllClose(sess_results["final_decoder_outputs"].rnn_output,
sess_results["final_rnn_outputs"][:, 0:max_out, :])
if use_sequence_length:
self.assertAllClose(sess_results["final_decoder_state"],
sess_results["final_rnn_state"])
def testDynamicDecodeRNNWithTrainingHelperMatchesDynamicRNNWithSeqLen(self):
self._testDynamicDecodeRNNWithTrainingHelperMatchesDynamicRNN(
use_sequence_length=True)
def testDynamicDecodeRNNWithTrainingHelperMatchesDynamicRNNNoSeqLen(self):
self._testDynamicDecodeRNNWithTrainingHelperMatchesDynamicRNN(
use_sequence_length=False)
if __name__ == "__main__":
test.main()
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